PORT WORKS DESIGN MANUAL PART 3 Guide To - The University ...

20• The rate of supply of public fill is not easily controllable, being dependentmainly on programming of engineering works and development projects. It isquite usual for the number of tracks per day to fluctuate, and the delivery ratescan vary widely from about 1,000 to 15,000 m 3 per day. The impact of thefluctuation of the rate of supply on the reclamation programme should becarefully assessed.• Strict site control is necessary to ensure that public fill does not containunsuitable material such as marine mud, household refuse, plastic, metal,industrial and chemical wastes, animal and vegetable matter and other materialconsidered unsuitable for reclamation.• Rock and concrete over 250 mm would impede subsequent piling, and has to bebroken down to this size or placed in areas zoned for open space and roads.® The use of public fill will generate a large number of delivery trucks at andaround the entrances and exits of the reclamation site or barging points. Theroute of the trucks going to and leaving the site or barging points should beproperly considered to avoid unacceptable disturbance to the existing traffic.Sufficient space should be allowed on site to cater for queuing of trucks andadequate traffic signs should be provided to give clear instructions to the truckdrivers. Transport Department, Police, District Office, District Councils andother relevant parties should be consulted in planning the traffic arrangement.• Where direct land access to the site is not available, or where controlled thinlayer fill placement is required in a reclamation using the drained method,contract arrangements should ensure that barges are available at all times toavoid the need for temporary stockpiling of public fill at the barge loading site.At the reclamation site, public fill will either be bottom-dumped by barges orplaced by grab, depending on the available water depth. Usually, completionof the reclamation to the required formation level is not possible using marineplant and direct grab placement, and the use of temporary stockpiles and finalplacement of fill using site trucks and spreading plant is common.« Public fill can be directly end-tipped onto the reclamation under the control ofsite supervisory staff when the dredged method is adopted or when the fillthickness or profiles already deposited on site in the drained method isadequately safe against slip failure or mud wave formation. In either case,